I am figuring out a way to generate a 1Hz 0.01V pulse to inject a little noise into a 1V supply in order to slightly agitate a monitoring circuit so it thinks the input is "real" and not artificially provided.

I have designed and built it with a 12VDC->1.5VDC voltage regulator powering the motor drive circuit of a cheap quartz clock, and then sending the stepper motor output to a voltage divider to give me about 0.01V pulses. It works like this but it's hardly robust and is certainly not elegant.

Anybody here know a better way, preferably one that can be potted? Any help would be appreciated. Thanks.